Your situation sounds similar to mine and we're close in age so perhaps my experience will help you. I begin to notice ED problems a few years ago which prompted me to get on HRT. I'll skip the details of the HRT, as it's not relevant for this thread, other than to say that it didn't help the ED. It certainly had other benefits (strength, well-being, libido) but improving erections/sensitivity was not among them. To make a long story short, I struggled with ED up until I discovered Dr. Life's book "The Life Plan" which prompted me to try a daily protocol of Arginine and Pycnogenol (A&P). After a couple weeks the improvement was like night and day. I can't say enough good things about this combo, it literally changed my life. All ED problems went away, sensitivity improved, it was like I was in my early twenties again. I've tried Cialis and Viagra and think A&P works better. Reason being Cialis and Viagra gave me headaches and didn't help much with sensitivity. The downside of A&P is it must be taken daily. As far as negative side effects, PeakT has done some good research and found a few risks - in particular related to herpes type 1 and 2. From my personal experience, I've noticed no negative effects. I get a rare cold sore every couple years and thus far I have not had a breakout or experienced any negative side effect while taking Arginine. So in my personal opinion, the research regarding the risks of Arginine is inconclusive and overblown. http://www.peaktestosterone.com/Herpes_Arginine
. Keep in mind Arginine is a natural amino acid and found in food. Granted, the dosage to treat ED is much larger than one will find in their diet, but nonetheless it is something we eat everyday with or without supplements.
My daily dosage consists 60 mg of Pycnogenol X2 a day (once in the AM and once in the PM). I take 5 grams of Arginine in the morning and 5 grams at night. However, honestly I don't think one needs to take this much Arginine. I used to take 2-3 grams in the morning only and felt the same benefits. Somewhere I got sold on the GH releasing effects of Arginine and decided to try more, thus far I'm not convinced and will likely reduce my dose back to 5 grams once in the AM. Why 5 grams? well, because that's the size of scooper that came with the container.
As far as product choices, I use  Arginine and NOW Pycnogenol. These ingredients are pretty generic so pick whatever brands you prefer.
Anyway, if your current regime (Citrulline Mallate powder form +lots of beetroot juice +pomegranate juice) doesn't deliver I highly recommend you give A&P a try. It works well for me.
Oh, one other comment. ED is considered the canary in the coal mine for heart disease. If you haven't done so, I would strongly recommend you take steps to reduce your risk for heart disease; i.e. reduce blood pressure to 120/80 or better, lower your total cholesterol to less than 150, LDL Cholesterol to less than 80. PeakT goes into great detail on this topic elsewhere so search this site and PeakT's other posts for further details. Good luck!